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dawson-et-al-2022-dynamics-of-droplets-impacting-on-aerogel-liquid-infused-and-liquid-like-solid-surfaces.pdf (4.47 MB)

Dynamics of droplets impacting on aerogel, liquid infused, and liquid-like solid surfaces

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posted on 2024-02-12, 14:17 authored by Jack Dawson, Samual Coaster, Rui Han, Johannes Gausden, Hongzhong Liu, Glen McHale, Jinju ChenJinju Chen

Droplets impacting superhydrophobic surfaces have been extensively studied due to their compelling scientific insights and important industrial applications. In these cases, the commonly reported impact regime was that of complete rebound. This impact regime strongly depends on the nature of the superhydrophobic surface. Here, we report the dynamics of droplets impacting three hydrophobic slippery surfaces, which have fundamental differences in normal liquid adhesion and lateral static and kinetic liquid friction. For an air cushion-like (super)hydrophobic solid surface (Aerogel) with low adhesion and low static and low kinetic friction, complete rebound can start at a very low Weber (We) number (∼1). For slippery liquid-infused porous (SLIP) surfaces with high adhesion and low static and low kinetic friction, complete rebound only occurs at a much higher We number (>5). For a slippery omniphobic covalently attached liquid-like (SOCAL) solid surface, with high adhesion and low static friction similar to SLIPS but higher kinetic friction, complete rebound was not observed, even for a We as high as 200. Furthermore, the droplet ejection volume after impacting the Aerogel surface is 100% across the whole range of We numbers tested compared to other surfaces. In contrast, droplet ejection for SLIPs was only observed consistently when the We was above 5–10. For SOCAL, 100% (or near 100%) ejection volume was not observed even at the highest We number tested here (∼200). This suggests that droplets impacting our (super)hydrophobic Aerogel and SLIPS lose less kinetic energy. These insights into the differences between normal adhesion and lateral friction properties can be used to inform the selection of surface properties to achieve the most desirable droplet impact characteristics to fulfill a wide range of applications, such as deicing, inkjet printing, and microelectronics.

Funding

Biofilm Resistant Liquid-like Solid Surfaces in Flow Situations

Engineering and Physical Sciences Research Council

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DTP 2016-2017 Newcastle University

Engineering and Physical Sciences Research Council

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The Royal Society IEC\NSFC\191070

History

School

  • Aeronautical, Automotive, Chemical and Materials Engineering

Department

  • Materials

Published in

ACS Applied Materials & Interfaces

Volume

15

Issue

1

Pages

2301 - 2312

Publisher

American Chemical Society

Version

  • VoR (Version of Record)

Rights holder

© The Authors

Publisher statement

This is an Open Access Article. It is published by the American Chemical Society under the Creative Commons Attribution 4.0 International Licence (CC BY). Full details of this licence are available at: https://creativecommons.org/licenses/by/4.0/

Acceptance date

2022-12-14

Publication date

2022-12-29

Copyright date

2022

ISSN

1944-8244

eISSN

1944-8252

Language

  • en

Depositor

Prof Jinju Chen. Deposit date: 11 February 2024

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